linux-kernel - Re: [Bug #15192] netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f

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Message-Id: <1266814762.6072.3.camel@marge.simson.net>
Date:	Mon, 22 Feb 2010 05:59:22 +0100
From:	Mike Galbraith <efault@....de>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	venkatesh.pallipadi@...el.com, Len Brown <lenb@...nel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [Bug #15192] netperf ~50% regression with 2.6.33-rc1, bisect
 to 1b9508f

On Sat, 2010-02-20 at 15:52 +0800, Lin Ming wrote:
> On Mon, 2010-02-01 at 16:04 +0800, Mike Galbraith wrote:
> > On Mon, 2010-02-01 at 01:22 +0100, Rafael J. Wysocki wrote:
> > > This message has been generated automatically as a part of a report
> > > of recent regressions.
> > > 
> > > The following bug entry is on the current list of known regressions
> > > from 2.6.32.  Please verify if it still should be listed and let me know
> > > (either way).
> > 
> > Yes, it should remain open.  We're currently waiting for some data from
> > Lin Ming.  The regression itself isn't making much sense.. a kernel with
> > NEWIDLE disabled should show the same performance, but does not.  
> 
> (sorry for late response, I'm just back from vacation)
> 
> We finally located this to a bug in mwait based C-state entry.
> Venki's patch has fixed it.
> http://patchwork.kernel.org/patch/78544/
> 
> Venki, this is the original report,
> http://marc.info/?l=linux-kernel&m=126441481427331&w=4

Excellent, mystery solved.  (adds acpi)

	-Mike

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